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The Phenotype and Neural Correlates of Language in Autism: an Integrative Review

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The Phenotype and Neural Correlates of Language in Autism: an Integrative Review Neuroscience and Biobehavioral Reviews 32 (2008) 1416–1425 Contents lists available at ScienceDirect Neuroscience and Biobehavioral Reviews journal homepage: www.elsevier.com/locate/neubiorev Review The phenotype and neural correlates of language in autism: An integrative review Wouter B. Groen a,b,c,*, Marcel P. Zwiers b,c, Rutger-Jan van der Gaag a,b, Jan K. Buitelaar a,b a Karakter, Child and Adolescent Psychiatry University Centre, Nijmegen, The Netherlands b Department of Psychiatry, Radboud University Nijmegen Medical Centre, Reinier Postlaan 10, 6500 Nijmegen, The Netherlands c FC Donders Centre for Cognitive Neuroimaging, Radboud University Nijmegen, Nijmegen, The Netherlands ARTICLE INFO ABSTRACT Keywords: Although impaired communication is one of the defining criteria in autism, linguistic functioning is Autism highly variable among people with this disorder. Accumulating evidence shows that language Language impairments in autism are more extensive than commonly assumed and described by formal diagnostic Connectivity criteria and are apparent at various levels. Phenotypically, most people with autism have semantic, Brain syntactic and pragmatic deficits, a smaller number are known to have phonological deficits. Phenotype Neural Neurophysiologically, abnormal processing of low-level linguistic information points to perceptual difficulties. Also, abnormal high-level linguistic processing of the frontal and temporal language association cortices indicates more self-reliant and less connected neural subsystems. Early sensory impairments and subsequent atypical neural connectivity are likely to play a part in abnormal language acquisition in autism. This paper aims to review the available data on the phenotype of language in autism as well as a number of structural, electrophysiological and functional brain-imaging studies to provide a more integrated view of the linguistic phenotype and its underlying neural deficits, and to provide new directions for research and therapeutic and experimental applications. ß 2008 Elsevier Ltd. All rights reserved. Contents 1. Introduction . 1417 2. Methods....................................................................................................... 1417 3. The phenotype of language disorders in autism . 1418 3.1. Phonology . 1418 3.2. Semantics . 1418 3.3. Syntax................................................................................................... 1418 3.4. Pragmatics and prosody. 1419 4. The neural correlates of language disorders in autism . 1419 4.1. Structural abnormalities . 1419 4.2. Auditory perception and lower-level language paradigms. 1420 4.3. Higher-level language paradigms . 1421 5. Discussion . 1421 5.1. The relationship between linguistic impairments and social and restricted/repetitive impairments in autism . 1422 5.2. Genetic, endophenotypical and behavioural correspondence between autism and language impairments . 1422 5.3. Implications for therapies and directions for future research . 1423 References . 1423 * Corresponding author at: Department of Psychiatry, Radboud University Nijmegen Medical Centre, Reinier Postlaan 10, 6500 Nijmegen, The Netherlands. Tel.: +31 24 3512222; fax: +31 24 3512211. E-mail address: [email protected] (W.B. Groen). Abbreviations: AS, Asperger syndrome; ASD, autism spectrum disorder; DTI, diffusion weighted imaging; ERP, evoked response potentials; fMRI, functional magnetic resonance imaging; HFA, high-functioning autism; MEG, magnetoencephalography; MMN, mismatch negativity; PDD-NOS, pervasive developmental disorder not otherwise specified; SLI, specific language impairment; ToM, theory of mind; WCC, weak central coherence. 0149-7634/$ – see front matter ß 2008 Elsevier Ltd. All rights reserved. doi:10.1016/j.neubiorev.2008.05.008 W.B. Groen et al. / Neuroscience and Biobehavioral Reviews 32 (2008) 1416–1425 1417 1. Introduction ment in ToM in autism therefore causes an inability to comprehend the meaning of words. Furthermore, acquisition of language may Autism is a neurodevelopmental disorder associated with be mediated by shared or joined attention, which, in case of an lifelong handicaps in social adaptation. The disorder is defined by a impaired ToM, would be impaired as well (Kuhl et al., 2003). description of symptoms in three domains: social interaction, Semantic ability and false belief have indeed been found to verbal and non-verbal communication and stereotyped behaviour correlate in children with autism (Tager-Flusberg, 2000). (American Psychiatric Association, 1994). Autism is currently The psychological framework provided by these top-down considered to be one of the autism spectrum disorders (ASD), theories assumes that an impaired high-level cognitive function is which also include the Asperger syndrome (AS) and pervasive causing the impairments in autism. This assumption has been developmental disorder not otherwise specified (PDD-NOS). The criticised for several reasons. Firstly, converging evidence suggests term spectrum refers both to the heterogeneity of the ASD disorders that abnormalities of the processing of low-level sensory and the wide variety in functional ability. Although not universally information may lead to impairments in higher-order cognitive agreed upon, the definition of AS provided in DSM-IV entails functions, rather than the other way around (Happe and Frith, impaired social interaction and stereotyped behaviour in the 2006; Bertone et al., 2005). That is to say, altered low-level absence of language and cognitive delay (Klin et al., 2005). perceptual processing in autism should not be considered a by- Individuals with PDD-NOS fail to meet the full criteria for autism. product of weak central coherence. Quite on the contrary, This is the case when the number of criteria met is sub-threshold, perceptual abnormalities give rise to weak central coherence. or the onset occurs over the age of 3, or atypical symptoms are Secondly, these neuropsychological top-down theories are present, or a combination of the above (Buitelaar and van der Gaag, descriptive rather than explanatory, and finding the neural 1998; Buitelaar et al., 1999). correlates of these theories has been proven difficult since their Linguists commonly describe language and language disorders predictions of cortical functioning are too general to be falsifiable. in terms of phonology, semantics, syntax and pragmatics, and since Nevertheless, there have been converging efforts from different the early seventies, researchers have been analysing linguistic disciplines to document the neural correlates underlying the deficits in autism using these categories (Cromer, 1981). Whereas symptoms of ASD (Volkmar et al., 2004). Although most of the phonology deals with the perception and production of sound research has focused on impairments in social cognition (mostly units whose concatenation produces words, semantics deals with using visual stimuli such as faces), language impairments in autism the meaning of lexical items, syntax with the structure of words in are increasingly recognised. More and more findings on the clinical sentences, and pragmatics with the conventions and rules phenotype and the neural substrates of language and commu- governing the use of language for communication (Boucher, nication in autism are being added to the literature, but the broad 2003). From a neuroscientific perspective, however, there is no field of autism research and the many different analytical clear-cut relation between linguistic categories and cortical approaches make it difficult to oversee the current literature. This function. Recent functional imaging studies have furthered the paper therefore aims to review recent evidence from structural, idea that the language system is organised in a large number of electrophysiological and functional studies on the neural corre- small but tightly clustered modules in both the left and right lates of linguistic abnormalities in autism. Findings on the hemisphere with unique contributions to language processing. phenotype of language impairments in autism will also be There is also increasing evidence that cortical language regions are addressed here. We will argue that the linguistic features in not specific to language, but involve more reductionist processes autism cover a wider range of impairments than described in the that give rise to language as well as non-linguistic functions DSM-IV criteria for autistic disorder and are more linked to the (Bookheimer, 2002). neural architecture in autism than earlier behavioural studies have Given the absence of a clear-cut relation between the linguistic suggested. More specifically, language ability varies greatly among categories and cortical function, it is unfeasible to deduce people with autism. Although most individuals with autism have neurobiological deficits in autism from the high-order language semantic, syntactic and pragmatic language deficits, there is also a deficits characterising the disorder. Instead, several psychological number that have phonological difficulties. Functional brain- theories, such as the weak central coherence (WCC) theory (Frith, imaging data show aberrant neural activation in semantic, 1996) and the impaired theory of mind (ToM) (Baron-Cohen et al., syntactic and pragmatic tasks of higher-order language functions, 1985), have attempted to explain the high-order language deficits as well as in low-level sensory processes. Furthermore, we will in autism. The weak central coherence theory predicts that, since argue that the
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